Damage assessment of structures by danamic tests = 동특성 측정에 의한 구조물의 손상도 추정

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Most civil engineering structures such as bridges, buildings, power plants, and offshore platforms are apt to suffer structural damages over their service lives caused by adverse loadings, such as earthquakes, wind and wave forces. Accumulation of structural damages over a long period time might cause catastrophic structural failure. Therefore, a , methodology for moniforing the structural integrity is essential for assuring the safety of the existing structures. One of the consequences of development of a crack or damage is the decrease in local stiffness which in turn results in a decrease in some of the natural frequencies. Hence, it may be very useful to monitor the dynamic characteristics of the structure for damage detection and safety assessment. Based on this concept, attempts have recently been made to develop technuques for using vibration measurements to evaluate the structural damage. Thchnuques for determining the dynamic characteristics of a structural system from experimentally ineasured data are commonly called system identification. The procedures available for system identification are classified into time domain technuques and freqeuncy domain techniques. In this dissertation, an improved method for estimating frequency response functions(FRF) is presented. Fruquency response functions are the most fundamental data for the identifications of the dynamic characteristics of structural systems. The new FRF estimator takes a wighted average of two conventional estimators, $H_1$(f) and $H_2$(f), utilizing the characteristics that $H_2$(f) gives more accurate estimate at resonance, while $H_1$(f) yields better result at antiresonance. Based on the estimated FRF``s, the modal parameters of the structural systems such as natural frequencies and mode shapes, are estimated. A method for the damage assessment of structures by the inverse modal perturbation technuque is also presented using the natural frequencies and mode shapes extracted from the estim...
Advisors
Yun, Chang-Bangresearcher윤정방researcher
Description
한국과학기술원 : 토목공학과,
Publisher
한국과학기술원
Issue Date
1993
Identifier
60686/325007 / 000835434
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 토목공학과, 1993.2, [ viii, 120 p. ]

URI
http://hdl.handle.net/10203/30445
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=60686&flag=dissertation
Appears in Collection
CE-Theses_Ph.D.(박사논문)
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